AMETEK Brookfield
Page 28
Manual No. M08-372-F1116
the probe will run at a speed slower than what was entered in the setup screen.
When the measure LOAD equals the TARGET LOAD assigned in the setup screen (the CT3 must
detect two readings at the target load for valid detection), the CT3 begins the HOLD portion of
the test. At this time, the DISTANCE value is saved, and the TIME field is replaced with the hold
time value which starts the count down to zero. The CT3 repositions the probe, as necessary, to
maintain the measured LOAD within 0.5% of the full scale load cell capacity. The LOAD and
DISTANCE fields remain active.
When the TIME field counts to zero, the test is stopped. The probe is retracted to the pre-positioned
start position using the post test speed. The display TIME remains at zero. DISTANCE and LOAD
fields remain active. The CT3 continues to internally record LOAD measurements and logs negative
values of LOAD as the probe moves upward. When the probe reaches the start position, the display
advances to the FINAL screen.
During the running of the test, pressing and holding the Select Knob causes the display to revert to
the setup screen, but the actual test will continue to run uninterrupted. Releasing the Select Knob
returns the display to the RUN screen. Activating the EMERGENCY STOP knob will terminate
the test and return the probe to the HOME position. Pressing the STOP button will also abort the
test, retract the probe to the HOME position, and return the display to the TARGET HOLD SETUP
screen.
After the probe has been returned to the start position, the display will show the test results:
DISTANCE AT START of hold period, DISTANCE AT END of hold period, DEFORMATION,
ADHESIVE FORCE, ADHESION, and TEMPERATURE. Since only four lines are available on
the display, rotating the Select Knob will scroll down for the added parameters. Figure III.31 shows
examples of a hypothetical test.
FINAL SCREEN
SCROLLED DOWN
DIST@START: 23.4 mm
DIST@END:
30.1 mm
DEFORMATION: 6.7 mm
ADH. FORCE: 33.5
g
DIST@END:
30.1 mm
DEFORMATION: 6.7 mm
ADH. FORCE: 33.5 g
ADHESION:
5.34 mJ
DEFORMATION: 6.7 mm
ADH. FORCE: 33.5
g
ADHESION:
5.34 mJ
TEMP:
100.6
C
FINAL SCREEN
SCROLLED DOWN
FINAL SCREEN
SCROLLED DOWN
Figure III.31
DEFORMATION is the difference in distance between DIST@START and the DIST@END.
ADHESION (ADHESIVENESS) is the area under the force vs. distance curve for ALL negative
values of load detected at the end of the test as the probe returns to the HOME position. (The current
standalone TPA test has a calculated final screen value called ADHESION, reported in mJoules. The
Target Hold calculation is performed in the same way.) ADHESIVE FORCE is the peak negative
Summary of Contents for BROOKFIELD CT3
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